/Engine/Plugins/Editor/ObjectMixer/ObjectMixer/Source/ObjectMixer/Public/Views/List/Modes/ObjectMixerOutlinerHierarchy.h
void ForEachActorInLevel ( [AActor](API\Runtime\Engine\GameFramework\AActor) * Actor, const [ULevelInstanceSubsystem](API\Runtime\Engine\LevelInstance\ULevelInstanceSubsystem) * LevelInstanceSubsystem, [TArray](API\Runtime\Core\Containers\TArray)< FSceneOutlinerTreeItemPtr > & OutItems ) const